This thread is mainly about air filters found on the Chevy Silverado, GMC Sierra, Chevrolet Suburban, and GMC Yukon.
There are two air filters listed which are standard and heavy duty. I purchased both and they look exactly the same except for a prefilter on the heavy duty version.
Standard duty is used on street/highway vehicles and heavy duty is for offroad where a prefilter is needed for typical off road conditions.
Why not use the heavy duty only? Its not needed for street driving. The heavy duty version is more restrictive with an added prefilter so less mpg and overall power.
There are two air filters listed which are standard and heavy duty. I purchased both and they look exactly the same except for a prefilter on the heavy duty version.
Standard duty is used on street/highway vehicles and heavy duty is for offroad where a prefilter is needed for typical off road conditions.
Why not use the heavy duty only? Its not needed for street driving. The heavy duty version is more restrictive with an added prefilter so less mpg and overall power.